What is the difference between ultra-thin EFU and regular EFU? Height, performance, maintenance and applicable equipment comparison

Direct answer: The main difference between ultra-thin EFU and conventional EFU is the height of the whole machine and the way the internal space is utilized. Ultra-thin EFU is suitable for projects with limited installation height on top of the equipment or inside; conventional EFU has relatively sufficient internal space and usually has greater design margin in terms of fan selection, airflow organization, heat dissipation and maintenance.

However, 'ultra-thin' and 'regular' only represent the structural form and cannot directly determine the air volume, filtration efficiency or service life. Actual selection still requires simultaneous comparison of installation space, target air volume, system static pressure, filter resistance, noise, control methods and maintenance paths.

The core difference between ultra-thin EFU and conventional EFU

What is ultra-thin EFU

The ultra-thin EFU is an equipment-side fan filter unit that integrates the fan, motor, control system and filter into a limited space while reducing the height of the entire machine.

It is usually used in projects where the top space of the equipment is insufficient, the internal structure is compact, or the overall height of the machine is limited, such as:

• Semiconductor front-end equipment;

• EFEM wafer transfer area;

• Lithography, inspection and precision processing equipment;

• SMT and electronic manufacturing equipment;

• Local clean air supply inside precision instruments;

• An automated production line that needs to control the overall height of the equipment.

Ai Li IndustrialThe overall height of the 70mm ultra-thin EFU is 70mm, which is suitable for equipment projects that have clear restrictions on installation height. The specific dimensions, air volume, static pressure, filtration efficiency and control interface still need to be determined according to the equipment drawings.

What is regular EFU

Conventional EFU usually adopts a relatively sufficient box height to reserve more space for the fan suction inlet, internal diffusion space, control components and filter installation.

When the equipment does not have strict height restrictions and requires larger air volume, higher static pressure margin, or more convenient maintenance conditions, conventional EFU can be evaluated first.

Regular EFU does not mean fixed size. Depending on the equipment opening, installation direction, air inlet and outlet forms, and control interfaces, it may still be necessary to adjust the box length and width, filter specifications, and fixing methods. Related structural forms can be found inthe EFU equipment fan filter unit product catalog .View

Will ultra-thin EFU affect air volume and static pressure?

The ultra-thin structure itself does not mean that the air volume must be small, but when the internal space is reduced, the fan suction inlet, control components, reinforced structures and air duct turns are more likely to form additional resistance.

Therefore, ultra-thin EFU needs to focus on checking the following factors:

1. The distance between the fan suction inlet and the box;

2. Whether the air inlet is blocked by the equipment structure;

3. Filter effective area and rated resistance;

4. The diffusion space between the fan outlet and the filter;

5. Do internal wiring harnesses, controls, and reinforcements block airflow;

6. Motor power, speed and temperature rise under target air volume;

7. Actual system resistance after equipment is installed.

If you select ultra-thin EFU based only on the parameters of the bare fan, the actual air volume may change after the cabinet and equipment are installed. The selection should be based on the complete system consisting of the fan, box, filter and equipment interface.

Is there any difference in the filtration efficiency of the two EFUs?

Both ultra-thin EFU and conventional EFU can be configured with high-efficiency or ultra-high-efficiency filters of corresponding efficiency levels according to project requirements. The filtration efficiency is mainly determined by the filter specifications and is not directly determined by the height of the EFU box.

However, under the same air volume, the effective area of ​​the filter will affect the surface wind speed and resistance. If the ultra-thin EFU is limited by both length and width, the filtering area may be relatively small. In this case, you need to recheck:

• Filter efficiency rating;

• Rated air volume and initial resistance;

• Actual effective filtration area;

• Target surface wind speed;

• The static pressure that the fan can provide;

• The operating resistance of the filter after dust accumulation;

• Sealing methods and leak detection requirements.

Therefore, when comparing two EFUs, you should not just look at the filtration level, but also compare the filter resistance and overall machine performance at the same operating point.

What is the difference in airflow uniformity?

The internal diffusion space of ultra-thin EFU is smaller, and the influence of fan position and air outlet structure on airflow distribution is usually more obvious. If the fan outlet, reinforcement or equipment frame causes partial obstruction, it may lead to differences in wind speed at different locations on the air outlet surface.

When designing ultra-thin EFUs, airflow uniformity can be improved and verified by:

• Select the fan position according to the filter length-to-width ratio;

• Reduce the structural obstruction on the suction and outlet sides of the fan;

• Optimize internal support and wiring harness layout;

• Use multiple measuring points to check the wind speed on the outflow surface;

• Retest the actual air supply conditions in key areas of the equipment;

• Adjust the rotation speed or internal structure based on the test results.

Although conventional EFU has relatively sufficient internal space, it also needs to be tested for wind speed. A higher cabinet does not mean that the airflow must be uniform, and the actual measurement results under the agreed working conditions should ultimately prevail.

Does ultra-thin EFU necessarily have higher noise?

uncertain. EFU noise is related to fan type, speed, working static pressure, box structure, installation stiffness and equipment resonance, and cannot be judged based on box thickness alone.

Under the same air volume requirement, if the ultra-thin EFU uses a higher speed to overcome the resistance of the compact air duct, the aerodynamic noise may increase; if the fan and the air duct are reasonably matched and the installation structure is stable, the operating noise can also be controlled.

When comparing noise, the test conditions should be consistent, including:

• Same target air volume;

• Same filter status;

• Same measured distance and location;

• Same equipment installation method;

• Same environmental background noise;

• Same operating gear.

If obvious noise only occurs in a certain speed range after installation, the equipment frame, guard and fixed points should also be checked for structural resonance.

What should you pay attention to for heat dissipation and continuous operation?

The ultra-thin EFU has a compact internal space and a small distance between the motor, controller and cables, so continuous operation temperature rise needs to be checked at the prototype stage.

Highlights include:

• The operating current and temperature rise of the motor at the target operating point;

• Whether the installation position of the controller affects heat dissipation;

• Whether the cable blocks the main airflow channel;

• Power changes during high-speed operation;

• Whether the temperature around the equipment is higher than the normal environment;

• Whether local heat accumulation occurs when multiple EFUs are installed together.

The internal space of conventional EFU is relatively sufficient, but if the working static pressure is high, the fan runs at high speed for a long time, or the air inlet is blocked, temperature rise problems may also occur. Both structures should complete continuous operation verification under actual working conditions.

What is the difference in maintenance methods?

Whether the EFU can be easily maintained depends on the equipment structure, disassembly and assembly direction and surrounding space, not entirely on the height of the box.

Ultra-thin EFUs are usually installed inside compact equipment. When maintaining the design, it is especially necessary to confirm:

If the top of the equipment cannot be opened, pull-down, lateral maintenance, or other non-standard structures may be required. The maintenance direction should be determined before the EFU drawing is confirmed and cannot be processed after the equipment is assembled.

Under what circumstances is it appropriate to choose ultra-thin EFU?

Ultra-thin EFU can be prioritized for evaluation when one or more of the following conditions are met:

• The equipment has strict restrictions on the overall height;

• The EFU must be installed in the top shield or narrow mezzanine;

• Only a small vertical installation space is allowed inside the device;

• Renovation of existing equipment cannot significantly adjust the main structure;

• EFEM or semiconductor equipment requires compact local clean air supply;

• Standard height EFUs may interfere with manipulators, pipelines or equipment covers.

Before choosing, you still need to confirm the air inlet clearance, filter area, air volume, static pressure and maintenance path. Being able to put ultra-thin EFU into the equipment does not mean that it has the conditions for normal operation and maintenance.

Under what circumstances is conventional EFU more appropriate?

If there is sufficient installation space and the project is more concerned with fan selection range, static pressure margin, heat dissipation or maintenance convenience, conventional EFU is usually easier to match the system.

Conventional structures can be evaluated first in the following situations:

• The top of the equipment has sufficient installation height;

• The target air volume or system resistance is high;

• Requires larger filter effective area;

• Hope to reduce the additional resistance caused by compact air duct;

• Fans and control components need to be more easily disassembled and assembled;

• The project does not require reducing the overall height of the equipment.

The necessary air intake, heat dissipation and maintenance space should not be compressed in the pursuit of 'ultra-thin'. The structural form should serve the equipment requirements rather than becoming an independent selection goal.

How to choose between ultra-thin EFU and conventional EFU

Judgment can be made in the following order:

1. Confirm installation boundaries: Provide available length, width, and height of equipment, installation openings, and surrounding interference information.

2. Determine the clean area: Identify the area inside the equipment that needs to be covered by the EFU.

3. Calculate air parameters: determine target air volume, wind speed and system static pressure.

4. Select a filter: Confirm efficiency rating, resistance, size and leak detection requirements.

5. Check the air inlet conditions: Check the suction inlet clearance and equipment structure obstruction.

6. Determine the direction of maintenance: clarify how to disassemble and install filters, fans and controllers.

7. Matching control interface: Confirm power supply, speed regulation, communication and equipment linkage methods.

8. Carry out prototype verification: check air volume, uniformity, noise, vibration and temperature rise.

9. Curing batch parameters: confirm drawings, materials, rotation speed and acceptance conditions.

If the conventional EFU can meet the equipment size and performance requirements, there is no need to use an ultra-thin structure simply to reduce the height; if the conventional EFU interferes with the equipment space, priority should be given to re-matching the ultra-thin structure, air intake method and maintenance direction.

Selection information list

How Aili Industry matches ultra-thin and conventional EFU

The difficulty in designing ultra-thin EFU is not to simply reduce the height of the box, but to rematch the fan, motor, filter, control components and airflow channel in a limited space.

Aili Industrial carries out supporting R&D and production around the motors, fans, control systems, sheet metal structures, air filters and complete machine assembly required for EFU. For highly restricted semiconductor equipment, EFEM and precision equipment projects, ultra-thin, small size, narrow body or special air inlet structures can be determined according to equipment drawings, and the actual air volume, static pressure, wind speed uniformity, noise and continuous operating temperature rise can be checked through prototype testing.

If the equipment has a standard installation space, you can also select a conventional EFU according to the target operating point, without increasing the difficulty of structural matching to reduce the height. Specific products can be viewedAili Industrial EFU product classification catalog ; highly restricted projects can be further understood70mm ultra-thin EFU . If the standard product cannot correspond to the equipment opening, air inlet direction or control interface, you canCustomized EFU for structure and parameter matching.

FAQ

Is the 70mm of the ultra-thin EFU the cabinet height or the overall height?

The 70mm of Aili Industrial's corresponding products is the overall height. There may be differences in the interfaces, filters and installation structures of different projects, and the drawings confirmed by both parties should prevail before mass production.

Is the air volume of ultra-thin EFU necessarily smaller than that of conventional EFU?

uncertain. Air volume depends on fan performance, filter resistance, internal air ducts and equipment system resistance. It needs to be compared under the same working conditions and cannot be judged only based on the height of the box.

Can ultra-thin EFU be equipped with high-efficiency or ultra-high-efficiency filters?

It can be configured according to project requirements, but the filter resistance, effective area, fan static pressure capacity, sealing and leak detection conditions should be checked at the same time.

Is ultra-thin EFU suitable for long-term continuous operation?

Whether it is suitable for continuous operation should be judged based on the motor, fan, controller, heat dissipation conditions and actual working point. Corresponding temperature rise and operational stability tests should be carried out during the prototype stage.

Can the regular EFU be changed to ultra-thin EFU and directly replaced?

Usually you can't just change the cabinet height. Fans, motors, internal air ducts, filters, fixing holes and control interfaces may need to be rematched. Before replacement, the equipment drawings should be checked and the performance of the entire machine should be verified.

Which one should I choose when device space allows?

If both structures can satisfy the equipment interface, air volume static pressure, air flow uniformity, noise, heat dissipation, maintenance and cost should be compared. When space is sufficient, conventional structures usually have more flexible design margins; when equipment height is limited, ultra-thin EFU is more targeted.

in conclusion

There is no absolute advantage or disadvantage between ultra-thin EFU and conventional EFU. The key lies in which structure is more suitable for the actual installation boundaries and operating conditions of the equipment.

When the height is limited and the equipment structure is compact, the ultra-thin EFU is given priority; when the space is sufficient and more fan matching and maintenance margin are required, the conventional EFU can be given priority. No matter which one you choose, you should check the air volume, static pressure, filtration efficiency, air flow uniformity, noise, temperature rise, control interface and maintenance conditions before finalizing.